hardy vs hardiness

hardy is not a noun while hardiness is a noun.

Word	Noun	Adjective	Verb	Adverb
hardy	No	Yes	No	No
hardiness	Yes	No	No	No

hardy (noun)	hardiness (noun)
	the property of being strong and healthy in constitution
	the trait of being willing to undertake things that involve risk or danger

hardy (adjective)	hardiness (adjective)
invulnerable to fear or intimidation
having rugged physical strength; inured to fatigue or hardships
able to survive under unfavorable weather conditions